SIMULATION OF DYNAMIC STRESSES IN VEHICLES AND COMPONENTS. PROCEEDINGS ENTITLED "THE DYNAMICS OF VEHICLES ON ROADS AND ON RAILWAY TRACKS"

A simulation technique suitable for general application in structured testing problems is presented. In designing the laboratory simulation test for complete road vehicles, the excitation environment is restricted to random road surface undulations which provide vertical input displacement into vehicle tires. The test objective is to simulate the vehicle's dynamic response, or a component within the vehicle as it travels along the road at constant speed, in the laboratory by subjecting each wheel to a random, varying displacement imposed by a servo-hydraulic actuator. The simulation technique is demonstrated by considering the problem of exciting a four-wheel vehicle through its tires. It is shown that, for good simulation, the number of excitation sources should equal the number of measuring points used in service to define the response. In certain circumstances, however, it may be possible to use a smaller number of excitation sources to achieve the desired response. It may even be possible to define the complete structural response with a limited number of excitation sources where service inputs and reactions, if any, are well-defined. The digital simulation technique which provides sample functions of the Gaussian random process used as excitation signals has wide application due to its ease of implementation with a minicomputer. Signals can be produced with properties completely defined over a certain period and repeatable within this period. Simulation of the service life is achieved by combining a series of Gaussian processes.

• Supplemental Notes:
  • Also published in HS-026 982U, "The Dynamics of Vehicles on Roads and on Railway Tracks. Proceedings of International Union of Theoretical and Applied Mechanics Symposium, Delft, The Netherlands, 1975 August 18-22," Amsterdam, 1976 p 233-50.
• Corporate Authors:

  International Union of Theoretical and Applied Mechanics

  Chalmers University of Technology, Sweden
  S-412 96 Gothenburg,   Sweden 
• Authors:
  • Dodds, C J
  • Robson, J D
• Publication Date: 1976

Media Info

• Features: References;
• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Digital computers; Dynamic loads; Excitation; Simulation; Vehicle dynamics
• Uncontrolled Terms: Digital techniques; Dynamic response
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00394105
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: HS-026 995U
• Files: HSL, USDOT
• Created Date: May 31 1985 12:00AM